invalidate WebView after Title change

Change-Id: Icae5462bddd4983b83c3383e8727e16c51a42fd5
diff --git a/core/java/android/webkit/WebView.java b/core/java/android/webkit/WebView.java
index e0783f3..f55608c 100644
--- a/core/java/android/webkit/WebView.java
+++ b/core/java/android/webkit/WebView.java
@@ -2382,6 +2382,8 @@
      */
     public void setTitleBarGravity(int gravity) {
         mTitleGravity = gravity;
+        // force refresh
+        invalidate();
     }
 
     /**